What is Rheostat ? What is its symbol ?
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Rheostat is a variable resistance.
The symbol is " Rh" and in circuits its symbol is like resistance but with a diagonal arrow.
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The electric current flowing through an electrical circuit is determined by two factors: the amount of voltage applied and the total resistance of the electrical circuit. If we reduce the circuit resistance, the flow of electric current through the circuit will be increased. On the other hand, if we increase the circuit resistance, the flow of electric current through the circuit will be decreased.
By placing the rheostat in the electrical circuit, we can control (increase or decrease) the flow of electric current in the circuit. Rheostat reduces the electric current flow to certain level. However, it does not completely blocks the electric current flow. To completely block the electric current flow, we need infinite resistance. Practically it is not possible to completely block the electric current.
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